'permanent' markers

What an amazing thread! I am astonished by the ingenuity of some of the ideas but also humbled by the confidence in the longevity of your plants. The box of now redundant labels on my potting bench is bad enough but engraved stones & bricks - the back of my greenhoouse would resemble a Memorial Park!
Erle
Anglesey. 10° and the cap of fog/low cloud has moved off followed inevitably by wind & rain.